General Description
The MAX4090 3V/5V, 6dB video buffer with sync-tip
clamp, and low-power shutdown mode is available in
tiny SOT23 and SC70 packages. The MAX4090 is
designed to drive DC-coupled, 150Ωback-terminated
video loads in portable video applications such as digi-
tal still cams, portable DVD players, digital camcorders,
PDAs, video-enabled cell phones, portable game sys-
tems, and notebook computers. The input clamp posi-
tions the video waveform at the output and allows the
MAX4090 to be used as a DC-coupled output driver.
The MAX4090 operates from a single 2.7V to 5.5V sup-
ply and consumes only 6.5mA of supply current. The
low-power shutdown mode reduces the supply current
to 150nA, making the MAX4090 ideal for low-voltage,
battery-powered video applications.
The MAX4090 is available in tiny 6-pin SOT23 and
SC70 packages and is specified over the extended
-40°C to +85°C temperature range.
Applications
Portable Video/Game Systems/DVD Players
Digital Camcorders/Televisions/Still Cameras
PDAs
Video-Enabled Cell Phones
Notebook Computers
Portable/Flat-Panel Displays
Features
♦Single-Supply Operation from 2.7V to 5.5V
♦Input Sync-Tip Clamp
♦DC-Coupled Output
♦Low-Power Shutdown Mode Reduces Supply
Current to 150nA
♦Available in Space-Saving SOT23 and SC70
Packages
MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
________________________________________________________________ Maxim Integrated Products 1
PART TEMP RANGE PIN-
PACKAGE
TOP
MARK
MAX4090EXT-T -40°C to +85°C 6 SC70-6 ABM
MAX4090EUT-T -40°C to +85°C 6 SOT23-6 ABOX
Ordering Information
GND
VCC
IN
16FB
5SHDN
OUT
MAX4090
SC70/SOT23
TOP VIEW
2
34
Pin Configuration
19-2813; Rev 1; 11/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX4090
CLAMP
1.2kΩ
2.3kΩ
580Ω780Ω
IN
OUT
FB
SHDN
GND
VCC
TOP VIEW
Block Diagram
MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC = 3.0V, GND = 0V, CIN = 0.1µF from IN to GND, RL= infinity to GND, FB shorted to OUT, SHDN = 3.0V, TA= -40°C to +85°C.
Typical values are at TA= +25°C, unless otherwise noted.) (Note 2)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: VCLP is the input clamp voltage as defined in the DC Electrical Characteristics table.
VCC to GND............................................................. -0.3V to +6V
OUT, FB, SHDN to GND............................ -0.3V to (VCC + 0.3V)
IN to GND (Note 1) ................................... VCLP to (VCC + 0.3V)
IN Short-Circuit Duration from -0.3V to VCLP ........................1min
Output Short-Circuit Duration to VCC or GND .......... Continuous
Continuous Power Dissipation (TA= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C) ...........695mW
6-Pin SC70 (derate 3.1mW/°C above +70°C) .............245mW
Operating Temperature Range ..........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range VCC Guaranteed by PSRR 2.7 5.5 V
VCC = 3V 6.5 10
Quiescent Supply Current ICC VIN = VCLP VCC = 5V 6.5 10 mA
Shutdown Supply Current ISHDN SHDN = 0V 0.15 1 µA
Input Clamp Voltage VCLP Input referred 0.27 0.38 0.47 V
Input Voltage Range VIN Inferred from voltage gain (Note 3) VCLP 1.45 V
Input Bias Current IBIAS VIN = 1.45V 22.5 35 µA
Input Resistance VCLP + 0.5V < VIN < VCLP + 1V 3 MΩ
Voltage Gain AVRL = 150Ω, 0.5V < VIN < 1.45V (Note 4) 1.9 2 2.1 V/V
Power-Supply Rejection Ratio PSRR 2.7V < VCC < 5.5V 60 80 dB
VCC = 3V 2.55 2.7
Output Voltage High Swing VOH RL = 150Ω to GND VCC = 5V 4.3 4.6 V
Output Voltage Low Swing VOL RL = 150Ω to GND VCLP 0.47 V
Sourcing, RL = 20Ω to GND 45 85
Output Current IOUT Sinking, RL = 20Ω to VCC 40 85 mA
Output Short-Circuit Current ISC OUT shorted to VCC or GND 110 mA
SHDN Logic-Low Threshold VIL VCC x 0.3 V
SHDN Logic-High Threshold VIH VCC x 0.7 V
SHDN Input Current IIH 0.003 1 µA
At DC 4
Shutdown Output Impedance ROUT
(
Disabled
)
SHDN = 0V At 3.58MHz or
4.43MHz 2kΩ
MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
_______________________________________________________________________________________ 3
Note 2: All devices are 100% production tested at TA= +25°C. Specifications over temperature limits are guaranteed by design.
Note 3: Voltage gain (AV) is referenced to the clamp voltage, i.e., an input voltage of VIN = VCLP + VI would produce an output volt-
age of VOUT = VCLP + AVx VI.
Note 4: Droop is guaranteed by the Input Bias Current specification.
AC ELECTRICAL CHARACTERISTICS
(VCC = 3.0V, GND = 0V, FB shorted to OUT, CIN = 0.1µF, RIN = 75Ωto GND, RL= 150Ωto GND, SHDN = VCC, TA= +25°C, unless
otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Small-Signal -3dB Bandwidth BWSS VOUT = 100mVP-P 55 MHz
Large-Signal -3dB Bandwidth BWLS VOUT = 2VP-P 45 MHz
Small-Signal 0.1dB Gain Flatness BW0.1dBSS VOUT = 100mVP-P 25 MHz
Large-Signal 0.1dB Gain Flatness BW0.1dBLS VOUT = 2VP-P 17 MHz
Slew Rate SR VOUT = 2V step 275 V/µs
Settling Time to 0.1% tSVOUT = 2V step 25 ns
Power-Supply Rejection Ratio PSRR f = 100kHz 50 dB
Output Impedance ZOUT f = 5MHz 2.5 Ω
VCC = 3V 1
Differential Gain DG NTSC VCC = 5V 0.5 %
VCC = 3V 0.8
Differential Phase DP NTSC VCC = 5V 0.5 Degrees
Group Delay D/dT f = 3.58MHz or 4.43MHz 20 ns
Peak Signal to RMS Noise SNR VIN = 1VP-P, 10MHz BW 65 dB
Droop CIN = 0.1µF (Note 4) 2 3 %
SHDN Enable Time tON VIN = VCLP + 1V, SHDN = 3V, VOUT settled
to within 1% of the final voltage 250 ns
SHDN Disable Time tOFF VIN = VCLP + 1V, SHDN = 0V, VOUT settled
to below 1% of the output voltage 50 ns
MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
4 _______________________________________________________________________________________
Typical Operating Characteristics
(VCC = 3.0V, GND = 0V, FB shorted to OUT, CIN = 0.1µF, RIN = 75Ωto GND, RL= 150Ωto GND, SHDN = VCC, TA= +25°C, unless
otherwise noted.)
SMALL-SIGNAL GAIN
vs. FREQUENCY
MAX4090 toc01
FREQUENCY (Hz)
GAIN (dB)
10M1M
-5
-4
-3
-2
-1
0
1
2
3
-6
100k 100M
AV = 2
VCC = 3V
VOUT = 100mVP-P
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX4090 toc02
FREQUENCY (Hz)
GAIN (dB)
10M1M
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
-0.6
100k 100M
AV = 2
VCC = 3V
VOUT = 100mVP-P
SMALL-SIGNAL GAIN
vs. FREQUENCY
MAX4090 toc03
FREQUENCY (Hz)
GAIN (dB)
10M1M
-5
-4
-3
-2
-1
0
1
2
3
-6
100k 100M
AV = 2
VCC = 5V
VOUT = 100mVP-P
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX4090 toc04
FREQUENCY (Hz)
GAIN (dB)
10M1M
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
-0.6
100k 100M
AV = 2
VCC = 5V
VOUT = 100mVP-P
LARGE-SIGNAL GAIN
vs. FREQUENCY
MAX4090 toc05
FREQUENCY (Hz)
GAIN (dB)
10M1M
-5
-4
-3
-2
-1
0
1
2
3
-6
100k 100M
AV = 2
VCC = 3V
VOUT = 2VP-P
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX4090 toc06
FREQUENCY (Hz)
GAIN (dB)
10M1M
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
-0.6
100k 100M
AV = 2
VCC = 3V
VOUT = 2VP-P
LARGE-SIGNAL GAIN
vs. FREQUENCY
MAX4090 toc07
FREQUENCY (Hz)
GAIN (dB)
10M1M
-5
-4
-3
-2
-1
0
1
2
3
-6
100k 100M
AV = 2
VCC = 5V
VOUT = 2VP-P
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX4090 toc08
FREQUENCY (Hz)
GAIN (dB)
10M1M
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
-0.6
100k 100M
AV = 2
VCC = 5V
VOUT = 2VP-P
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4090 toc09
FREQUENCY (Hz)
PSRR (dB)
10M1M100k
-70
-60
-50
-40
-30
-20
-10
0
-80
10k 100M
VCC = 3V
MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
_______________________________________________________________________________________ 5
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4090 toc10
FREQUENCY (Hz)
PSRR (dB)
10M1M100k
-70
-60
-50
-40
-30
-20
-10
0
-80
10k 100M
VCC = 5V
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX4090 toc11
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
7550250-25
6.35
6.40
6.45
6.50
6.55
6.60
6.65
6.70
6.75
6.80
6.30
-50 100
VCC = 3V
VCC = 5V
CLAMP VOLTAGE
vs. TEMPERATURE
MAX4090 toc12
TEMPERATURE (°C)
VCLAMP (V)
7550-25 0 25
0.25
0.30
0.35
0.40
0.45
0.50
0.55
0.60
0.20
-50 100
VCC = 3V
CLAMP VOLTAGE
vs. TEMPERATURE
MAX4090 toc13
TEMPERATURE (°C)
VCLAMP (V)
7550-25 0 25
0.25
0.30
0.35
0.40
0.45
0.50
0.55
0.60
0.20
-50 100
VCC = 5V
VOLTAGE GAIN vs. TEMPERATURE
MAX4090 toc14
TEMPERATURE (°C)
GAIN (V/V)
7550250-25
1.95
2.00
2.05
2.10
1.90
-50 100
VCC = 3V
VOLTAGE GAIN vs. TEMPERATURE
MAX4090 toc15
TEMPERATURE (°C)
GAIN (V/V)
7550250-25
1.95
2.00
2.05
2.10
1.90
-50 100
VCC = 5V
OUTPUT VOLTAGE HIGH SWING
vs. TEMPERATURE
MAX4090 toc16
TEMPERATURE (°C)
OUTPUT VOLTAGE HIGH (V)
7550250-25
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
2.0
-50 100
VCC = 3V
OUTPUT VOLTAGE HIGH SWING
vs. TEMPERATURE
MAX4090 toc17
TEMPERATURE (°C)
OUTPUT VOLTAGE HIGH (V)
7550250-25
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
5.0
4.0
-50 100
VCC = 5V
LARGE-SIGNAL PULSE RESPONSE
MAX4090 toc18
VOUT
1V/div
VIN
500mV/div
10ns/div
Typical Operating Characteristics (continued)
(VCC = 3.0V, GND = 0V, FB shorted to OUT, CIN = 0.1µF, RIN = 75Ωto GND, RL= 150Ωto GND, SHDN = VCC, TA= +25°C, unless
otherwise noted.)
MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
6 _______________________________________________________________________________________
SMALL-SIGNAL PULSE RESPONSE
MAX4090 toc19
VOUT
50mV/div
VIN
25mV/div
10ns/div
Typical Operating Characteristics (continued)
(VCC = 3.0V, GND = 0V, FB shorted to OUT, CIN = 0.1µF, RIN = 75Ωto GND, RL= 150Ωto GND, SHDN = VCC, TA= +25°C, unless
otherwise noted.)
DIFFERENTIAL GAIN AND PHASE
-1.0
-2.0
0
1.0
2.0
DIFFERENTIAL
PHASE (°)
DIFFERENTIAL
GAIN (%)
MAX4090 toc20
0123456
0123456
-0.5
-1.0
0
0.5
1.0
Pin Description Typical Application Circuit
MAX4090
CLAMP
IN
OUT
FB
GND
VCC
SHDN
RL
RIN
PIN NAME FUNCTION
1 OUT Video Output
2 GND Ground
3 IN Video Input
4V
CC
Power-Supply Voltage. Bypass with a 0.1µF
capacitor to ground as close to pin as
possible.
5SHDN Shutdown. Pull SHDN low to place the
MAX4090 in low-power shutdown mode.
6 FB Feedback. Short to VCC.
MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
_______________________________________________________________________________________ 7
Detailed Description
The MAX4090 3V/5V, 6dB video buffer with sync-tip
clamp and low-power shutdown mode is available in tiny
SOT23 and SC70 packages. The MAX4090 is designed
to drive DC-coupled, 150Ωback-terminated video loads
in portable video applications such as digital still cams,
portable DVD players, digital camcorders, PDAs, video-
enabled cell phones, portable game systems, and note-
book computers. The input clamp positions the video
waveform at the output and allows the MAX4090 to be
used as a DC-coupled output driver.
The MAX4090 operates from a single 2.7V to 5.5V sup-
ply and consumes only 6.5mA of supply current. The
low-power shutdown mode reduces the supply current
to 150nA, making the MAX4090 ideal for low-voltage,
battery-powered video applications.
The input signal to the MAX4090 is AC-coupled
through a capacitor into an active sync-tip clamp cir-
cuit, which places the minimum of the video signal at
approximately 0.38V. The output buffer amplifies the
video signal while still maintaining the 0.38V clamp volt-
age at the output. For example, if VIN = 0.38V, then
VOUT = 0.38V. If VIN = (0.38V + 1V) = 1.38V, then VOUT
= (0.38V + 2 X (1V)) = 2.38V. The net result is that a 2V
video output signal swings within the usable output
voltage range of the output buffer when VCC = 3V.
Shutdown Mode
The MAX4090 features a low-power shutdown mode
(ISHDN = 150nA) for battery-powered/portable applica-
tions. Pulling the SHDN pin high enables the output.
Connecting the SHDN pin to ground (GND) disables
the output and places the MAX4090 into a low-power
shutdown mode.
Applications Information
Input Coupling the MAX4090
The MAX4090 input must be AC-coupled because the
input capacitor stores the clamp voltage. The MAX4090
requires a typical value of 0.1µF for the input clamp to
meet the Line Droop specification. A minimum of a
ceramic capacitor with an X7R temperature coefficient
is recommended to avoid temperature-related prob-
lems with Line Droop. For extended temperature opera-
tion, such as outdoor applications, or where the
impressed voltage is close to the rated voltage of the
capacitor, a film dielectric is recommended. Increasing
the capacitor value slows the clamp capture time.
Values above 0.5µF should be avoided since they do
not improve the clamp’s performance.
The active sync-tip clamp also requires that the input
impedance seen by the input capacitor be less than
100Ωtypically to function properly. This is easily met
by the 75Ωinput resistor prior to the input-coupling
capacitor and the back termination from a prior stage.
Insufficient input resistance to ground causes the
MAX4090 to appear to oscillate. Never operate the
MAX4090 in this mode.
Layout and Power-Supply Bypassing
The MAX4090 operates from single 2.7V to 5.5V sup-
ply. Bypass the supply with a 0.1µF capacitor as close
to the pin as possible. Maxim recommends using
microstrip and stripline techniques to obtain full band-
width. To ensure that the PC board does not degrade
the device’s performance, design it for a frequency
greater than 1GHz. Pay careful attention to inputs and
outputs to avoid large parasitic capacitance. Whether
or not you use a constant-impedance board, observe
the following design guidelines:
•Do not use wire-wrap boards; they are too inductive.
•Do not use IC sockets; they increase parasitic
capacitance and inductance.
•Use surface-mount instead of through-hole compo-
nents for better, high-frequency performance.
•Use a PC board with at least two layers; it should be
as free from voids as possible.
•Keep signal lines as short and as straight as possible.
Do not make 90°turns; round all corners.
Chip Information
TRANSISTOR COUNT: 755
PROCESS: BiCMOS
MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
8 _______________________________________________________________________________________
Figure 1. Typical Operating Circuit
MAX4090
CLAMP
IN
OUT
FB
GND
VCC
SHDN
RL
75Ω
RIN
75Ω
CBYP
0.1µF
ROUT
75Ω
VCC = 2.7V TO 5.5V
CIN
0.1µF
RSOURCE
75Ω
ESIGNAL
EOUT
MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
_______________________________________________________________________________________ 9
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
SC70, 6L.EPS
MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
6LSOT.EPS
F1
1
21-0058
PACKAGE OUTLINE, SOT-23, 6L
